Hi all, I've just put together two rotators for Az/El, but I would like to build a controller/write some software to control them. It's a bit difficult using two controllers. Has anyone got circuit diagrams for the AR300XL and the Channel Master 9500A, they both use 3 wire from controller to rotator. Thanks in advance. 73 - Alan, G8UFN. AMSAT-UK, 6172.